FIGURES 133–141. Fig. 133. Mastogloia crucicula var. alternans. Fig. 133. SEM internal valve view. Fig. 133a in Diatoms (Bacillariophyta) From Artificial Substrates And Sediments In The Caribbean Sea Off Yucatan, Mexico

FIGURES 133–141. Fig. 133. Mastogloia crucicula var. alternans. Fig. 133. SEM internal valve view. Fig. 133a. SEM detail of partecta. Fig. 134. Cymatoneis cf. margarita. Figs. 135–138. M. crucicula var. crucicula. Fig. 135. LM valve view. Figs. 136–138. SEM internal view. Fig. 139. M. ovulum. Figs. 140–141. M. pseudolatecostata. Scale bar: figs. 133, 134, 136, 138 = 1 μm, figs. 135, 139, 140 = 10 μm.